The role and specific process of anodizing treatment on the surface of aluminum profiles | fscyal.com


Posted October 10, 2020 by yiyiworld

Enhance anti-corrosion performance: the aluminum profile made by heating and extruding the aluminum rod has a very thin film on the surface, only a few microns, and aluminum is a very lively metal, which is easy to interact with oxygen in the air.

 
The role of anodizing of aluminum profiles

①Enhance anti-corrosion performance: the aluminum profile made by heating and extruding the aluminum rod has a very thin film on the surface, only a few microns, and aluminum is a very lively metal, which is easy to interact with oxygen in the air. Combined with substances such as water and water, aluminum oxide and aluminum hydroxide are formed through chemical reactions, and the corrosion resistance is very poor. The film layer can be thickened by anodic oxidation treatment to more than 10 μm, which can resist the corrosion of various acid and alkali substances. Improve the service life and mechanical properties of aluminum profiles.

②Improve the decoration performance: The surface of the extruded aluminum profile shows the original color of aluminum, that is, silver white. Through anodizing treatment, according to customer requirements and use requirements, the original silver white can be changed by oxidative coloring technology. In various colors such as golden yellow, brown, red, etc., to improve the decorative performance of aluminum profiles.

③ Increase insulation: Aluminum profile is an alloy material composed of alloy elements such as copper, manganese, zinc, etc. It has electrical conductivity. After anodizing, a protective film is formed on the surface to form a new insulation material, which does not have Electrical conductivity can protect the safety of electronic components and is suitable for the production of electronic products.

④Improve the coating adhesion: The substrate surface of the aluminum extrusion profile is covered with a thin layer of aluminum oxide. In order to facilitate the processing of oxidative coloring, anodization is required to open the micropores on the surface of the aluminum profile. It is convenient for the organic dye to adhere better to the coating surface. Finally, the sealing performance makes the various properties of the aluminum profile surface more stable.

Principle of anodizing of aluminum profiles

Anodizing of aluminum profiles is to place aluminum profiles in a solution of sulfuric acid, chromic acid or oxalic acid, and use aluminum as an anode to conduct electrolysis and oxidation under the action of current. Improve the corrosion resistance, abrasion resistance, high temperature resistance and decorative performance of the surface of aluminum profiles. This process of forming anodized films is called anodizing of aluminum profiles. If there is no special emphasis, the anodizing of aluminum profiles usually refers to sulfuric acid Anodizing, this is the most widely used method. The specific chemical reaction equation that occurs in sulfuric acid solution is as follows:

2H ﹢+ 2e ﹣ === H₂ ↑

4OH﹣ + 4e ﹣ === 2HO₂ + O₂ ↑

2Al³ ﹢+ 3O² ﹣ === Al₂O₃ + heat

Al₂O₃ + 3H₂SO4 → Al₂ (SO4) ₃ + 3H₂O

Source: https://www.fscyal.com/the-role-and-specific-process-of-anodizing-treatment-on-the-surface-of-aluminum-profiles/
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Last Updated October 10, 2020